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Chrome DevTools
Console API
Before we start..
Console API
Do not use
console.log
ONLY!
console.time()
console.time("Array initialize");
var array= new Array(100000);
for (var i = array.length - 1; i >= 0; i--) {
array[i] = new Object();
};
console.timeEnd("Array initialize");
console.time()
console.time(
"Array initialize" );
console.timeStamp()
MarkingtheTimeline
function AddResult(name, result) {
console.timeStamp("Adding result");
//do something….
}
Chorme devtools
console.count()
function login(user) {
console.count("Login called for user " + user); }
users = ['Irish', 'Bakaus', 'Kinlan' ];
users.forEach(function(element, index, array) {
login(element);
});
login(users[0]);
console.group()
var user = "jsmith", authenticated = false;
console.group("Authentication phase");
console.log("Authenticating user '%s'", user);
// authentication code here...
if (!authenticated) {
console.log("User '%s' not authenticated.", user)
}
console.groupEnd();
Chorme devtools
function Person(firstName, lastName, age) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
var family = {};
family.mother = new Person("Susan", "Doyle", 32);
family.father = new Person("John", "Doyle", 33);
family.daughter = new Person("Lily", "Doyle", 5);
family.son = new Person("Mike", "Doyle", 8);
console.table(family, ["firstName", "lastName", "age"]);
console.table()
還有些很好用的…
console.assert(expression, object)
console.dir(object)
console.dirxml(object)
console.trace()
Command Line API
Selecting Elements
$_ : the most recently evaluated expression
$0 - $4 : last five DOM elements
$('#id') : document.querySelector().
$$('img') : document.querySelectorAll()
$x('html/body/p') : Xpath
$_ :
…………………
Demo : google.com
inspect() //display the element
function sum(x, y) {
return x + y;
}
monitor(sum);
unmonitor(sum);
monitor
inpsect
monitor event
monitor event
monitorEvents(object[,events])
monitorEvents(window, ["resize", "scroll"]);
unmonitorEvents(window);
Element
Tips
 Hide element : [H]
 Element pseudo states:
(:active, :hover, :focus, :visited)
 Styles : color palette
Dom Breakpoints
http://ppt.cc/mjm3j
Porperties
Workspace
Chorme devtools
Tips
 Replace Sublime Text
 Source Map
Source
Chorme devtools
Debugging JavaScript
 Event Listeners
 SetInterval
 SetTimeout
 XMLHttpRequest
 Promises
 RequestAnimationFrame
 MutationObservers
Asynchronous JS callbacks
Fullstacktrace
Breakpoints
A breakpoint is an intentional
stopping or pausing place in a script
Breakpoints http://todomvc.com/examples/angularjs/
Demo 1
Chorme devtools
Demo 2
 Watch Expressions
 debugger
 console.trace()
Demo 3
MutationObserver
Network
Resource Timing API
window.performance.timing
[firebug]
參考資料 : http://ppt.cc/HHeT3
Resource Timing API
window.performance.getEntries()
//return an array of “resource timing objects”
Chorme devtools
HAR
http://ericduran.github.io/chromeHAR/
Tips
 Resource previews
 Sorting and filtering
 Websocket frames
Websocket Frames
https://www.websocket.org/
Chorme devtools
 Request Sent / Sending
 Waiting (TTFB)
 Content Download / Downloading
Thank you

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Chorme devtools

Hinweis der Redaktion

  1. console.dir(MutationObserver)
  2. console.dir(MutationObserver)
  3. console.dir(MutationObserver)
  4. console.dir(MutationObserver)
  5. console.dir(MutationObserver)
  6. console.dir(MutationObserver)